EBEX

EBEX (for E and B Experiment) was a 1.5 m balloon-borne radio telescope that surveyed CMB polarization in 2012/2013 aiming to sense polarization modes (E-modes and B-modes). It used transition edge sensor (TES) bolometers operating at 0.25 K, centered on three frequencies, 150 GHz, 250 GHz, and 410 GHz.